Is this an American thing, or a 9-5 thing? I'm a shift worker from the UK so I don't get any of this.
Both. The platonic ideal of an American job is 9-5 with Thursday as the busy day and Friday as the day to unwind and finish up little things.
This ideal is bullshit.
Btw, I guess you could say that this is a "hot take" five years in the making, as I've been a hater of happy Friday since late 2012.